ref: 12fa017f3fc2687d3afb166fd30d9b134abb1da5
dir: /sys/src/cmd/python/Parser/intrcheck.c/
/* Check for interrupts */ #include "Python.h" #ifdef QUICKWIN #include <io.h> void PyOS_InitInterrupts(void) { } void PyOS_FiniInterrupts(void) { } int PyOS_InterruptOccurred(void) { _wyield(); } #define OK #endif /* QUICKWIN */ #if defined(_M_IX86) && !defined(__QNX__) #include <io.h> #endif #if defined(MSDOS) && !defined(QUICKWIN) #ifdef __GNUC__ /* This is for DJGPP's GO32 extender. I don't know how to trap * control-C (There's no API for ctrl-C, and I don't want to mess with * the interrupt vectors.) However, this DOES catch control-break. * --Amrit */ #include <go32.h> void PyOS_InitInterrupts(void) { _go32_want_ctrl_break(1 /* TRUE */); } void PyOS_FiniInterrupts(void) { } int PyOS_InterruptOccurred(void) { return _go32_was_ctrl_break_hit(); } #else /* !__GNUC__ */ /* This might work for MS-DOS (untested though): */ void PyOS_InitInterrupts(void) { } void PyOS_FiniInterrupts(void) { } int PyOS_InterruptOccurred(void) { int interrupted = 0; while (kbhit()) { if (getch() == '\003') interrupted = 1; } return interrupted; } #endif /* __GNUC__ */ #define OK #endif /* MSDOS && !QUICKWIN */ #ifndef OK /* Default version -- for real operating systems and for Standard C */ #include <stdio.h> #include <string.h> #include <signal.h> static int interrupted; void PyErr_SetInterrupt(void) { interrupted = 1; } extern int PyErr_CheckSignals(void); static int checksignals_witharg(void * arg) { return PyErr_CheckSignals(); } static void intcatcher(int sig) { extern void Py_Exit(int); static char message[] = "python: to interrupt a truly hanging Python program, interrupt once more.\n"; switch (interrupted++) { case 0: break; case 1: #ifdef RISCOS fprintf(stderr, message); #else write(2, message, strlen(message)); #endif break; case 2: interrupted = 0; Py_Exit(1); break; } PyOS_setsig(SIGINT, intcatcher); Py_AddPendingCall(checksignals_witharg, NULL); } static void (*old_siginthandler)(int) = SIG_DFL; void PyOS_InitInterrupts(void) { if ((old_siginthandler = PyOS_setsig(SIGINT, SIG_IGN)) != SIG_IGN) PyOS_setsig(SIGINT, intcatcher); } void PyOS_FiniInterrupts(void) { PyOS_setsig(SIGINT, old_siginthandler); } int PyOS_InterruptOccurred(void) { if (!interrupted) return 0; interrupted = 0; return 1; } #endif /* !OK */ void PyOS_AfterFork(void) { #ifdef WITH_THREAD PyEval_ReInitThreads(); #endif }